Strainer for coffee makers



" 17; 1940. T. J. ANDERS STRAINER FOR COFFEE MAKERS Filed Dec. 12, 1938 Patented Dec. 17, 194i) V I STBAINER ron coma MAKERS Thomas J. Anders Portland, Oreg. Application December 12, 1938, Serial No. 245,210

4 Claims. (Cl. 210-162) This invention relates to an improved strainer marked S2, which is an oppositely facing shoulfor the well known glass coifee makers having a der of smaller diameter. I prefer to place longilower vessel in which water is heated and then tudinal grooves such as 6 in the tapered portion forced by steam pressure intoa vessel hermetiof the rod that are longitudinally coextensive 5 cally sealed in superposition and containing with the tapered portion, since the coil spring 5 ground coffee, where the brewing takes place. 1, shown partially sectioned in Fig. I and in full From thence the liquid coffee returns again to cross section in Fig. II will have abetter support. the lower vessel, when the same is removed from The coil spring I is a close wound coil made the fire and a drop in temperature causes the from stainless steel, silver plated wire or other 10 steam to condense. To make clear "coffee the suitable metal and is of such overall len th 10 liquid must be strained. that when compressed and placed in position be- Generally the straining is done through a tween the shoulders S and S2, the several lays piece of fabric, which requires frequent renewal; will be substantially in contact. The spring and various other expedients have been used. must be resilient enough so that it will snap The criterion to be met is a strainer that is over the bulb 8 onto the shoulder S2. It is like- 15 effective, easily cleaned and does not require rewise tapered to make a neat fit on the external newal except in case of damage that cannot occur tape ed P n the rod being 1 Such tduring use, and-it is' an object of this invention side diameter that it will come to rest in the to meet the conditions stated. tube 4, leaving a substantial portion of its upper 4 UNITED STATES. PATENT OFFICE Another object is a strainer devicethat is little length exposed, such as that portion below the n subject to accumulating the brown deposit comline II1I and extending to the point Ill where mon to all coffee making devices, which has a its external surface frictionally contacts the intendency to flavor newly made coffee with the side of the tube 4. The rod 5 may be made of rancid taste of other brews of days before; annealed glass or other suitable material.

I accomplish the objects stated and others The mode of operation ofthis structure is at that will be apparent, by the structure illustrated nce c ea in he accompanying drawing and described in Liquid, such as water, being forced upward M this specification, the novel features of which are towards the brewing vessel 2- by steam pressure particularly pointed out in'theclaims that folenerated in the p ssure es starts p the 30 low. I tube 1, being forced between the coils of the m In the drawingspring I and into the grooves 6. When it reaches Fig. I is a view ofthe preferred embodiment 8 point above the point Ill, it flows outwardly of my invention, shown in connection with aconagain. through the upper exposed part of the ventional glass coffee maker hereinbefore repri 1. throu the 00115 W r it mixes w "'35 ferred to, the delineation of the coflee maker the u d OOflEQthat Will have b e P ed in u bodiesbeing diagrammatic; the brewing vessel 2.

Fig. 11 is a section on the line 11-11 of Fig, I, When the pressure vessel is removed from the Further describing the drawing, I is the pressource of heat and the pressure therein falls sure vessel portion of the coffee maker and z is below th boilin p in r vi y usually sted 4c the brewing vessel, hermetically sealed to the y a developed vacuum condition in the 0 pressure vessel by the annular rubber seal 3. sure vessel l causes the brewed coffee liquid to I is the essential siphon tube which may be reverse the direction of flow. made a part of the brewing vessel 2 or made se a- The liquid enters between the coils in the uprate and attached in any preferred manner. per p ed P r on of he spring I to the grooves Tubes such as l are customarily made cylindriand downward to the pressure vessel I and must cal with an inner diameter of about H of an needs pass outwardly etw en the lower ils 01 inch, more or less. So far as this description the spring h ce the liquid 0011568 18 Strained has here progressed, the structure is broadly twice through thespring. old and is no part of the present invention, It is not always necessary to make the spring though the invention is intended to. cooperate long enough for double straining and I do not with the old structure to produce an improved wish to limit myself to this construction beresult. cause the uppefportion of the spring in the FirstI make a rod member l that ispreferably brewing chamber will alone do good work, es-

tapered uniformly from the point marked 8. pecially if the ground coflee'is not too fine.

which indicates an abrupt shoulder, to .the point I prefer to make the rod I long enough sothat it may be readily grasped by the fingers for convenience in placing and removing, as shown, and a hand-hold I! will be found convenient.

When it is desired to remove the spring for cleaning, a downward pressure combined with a twisting movement in direction opposite to the lay of the coil spring ,I readily removes it with practically a single motion The proportions.

may be varied within considerable limits it it be borne in mind that some exposure of the spring above where it contacts the inside of the tube I, is

essential for free operation and of course a portion where the liquid coifee can escape, such as the tapered annular space I5, as shown. If the lower portion of the spring is omitted, the grooves 6 will be co-extensive with the lower part of 5.

What I claim as new and desire to secure by Letters Patent isv 1. In a strainer for a coffee maker comprising upper and lower vessels, a cylindrical siphon tube, a tapered metal coil with a median diameter that fits inside the upper end of the tube, a rod in said coil and means on said rod for engag-- ing said coil in close cooperative engagement to substantially close both ends thereof, the said rod being formed to provide a liquid space intermediate the ends of the coil when mounted, whereby liquid is first strained in through the upper portion of the coil and then out through the lower portion of the coil.

2. A strainer device for a-coflee maker of the.

class described including two separable vessels, one of which is superposed on the other with a cylindrical siphon tube therebetween, comprising a supporting rod, a removable tapered metal coil that covers a substantial portion of the rod,

coil in the said superposed chamber.

3. A strainer for a relatively cylindrical siphon tube, comprising a tapered rod member, a

tapered coil mounted on said rod member to provide a fluid space between the rod and coil, and shoulders on the rod member for retaining the coil and substantially closing both of its ends, the outside diameter of said coil being so proportioned that it' is insertable only a part of its length into the siphon tube to leave an upper exposed part as a strainer and a lower portion within the tube to restrain the fluid back into the tube.

4. A strainer for a coffee maker comprising a lower vessel, a superposed vessel and a siphon tube therebetween, comprising a. close laid tapered metal coil insertable into the siphon tube to partially project into the upper vessel, a tapered rod inside the coil and shoulders on said rod positioned to substantially close both ends of said coil, said rod being so formed intermediate 'the shoulders that a substantial portion of the intermediate portion of the rod is out of contact with the coil whereby fluid from the upper vessel first flows intothe space between the coil 

